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In Reply to: RE: HD 600 and ll1660 10ma posted by KevinC on March 14, 2013 at 08:53:36
triode connected E180F
paralleled 5670/396A/2C51
paralleled 5687 at low current
paralleled or single 6922
??
Follow Ups:
OK, 6cb5 triode connected. I'm guessing the output won't be enough to make the HD600 go...
http://frank.pocnet.net/sheets/106/6/6BC5.pdf
http://frank.pocnet.net/sheets/106/6/6BC5.pdf
It'd go... just not very low. What you're needing is low plate resistance (Rp).
E180F as triode, 10mA, 200V plate, bias -2.5V or so. Cost you $5 NOS each, gold pin SQ 10,000hr tube. Rp ~2000ohms, plenty of gain. Linear too.
For kicks, I'd parallel a 5687 at 4mA per section, 100V plate, 8mA total for ~1k drive Rp. For the $10 you might even like it. Fancy Japanese manufacturer ran single section like that in a well received linestage. You got nothing to lose.
Have Fun!!
Shane
that should be 6bc5 sorry
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